So yes, this is part 3 to last weeks story. This is because this is an entire novel. A very brief recap of last weeks episode, so spoilers right now. John and Liam make it out of the mall and began to head north to the capital of The Nation. Upon arrival John abandons Liam at an orphanage leaving Liam there shocked. 

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Full book description. 

Liam lived a simple life in the same pattern, hide, get food, protect his sister, stay safe, stay sheltered. That was Liam’s life. However in a single moment, he loses everything that ever mattered to him, so he runs, he runs straight into John Perashing captain of the SkyHeart.

Ninety years ago the world was torn apart. After all that time it has finally begun to be rebuilt in the sky. John, the man responsible for this is terrified of losing what he built. When one of the few precious ground cities is burned down by monsters the world had thought long dead in The Fall, along with the rest of civilization. John is sent into a spiral racing around the world to try and end the bloodshed, and picking up an unexpected passenger along his way. This is the story of the airship SkyHeart.

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Website 

https://www.skyindustry.net/airheart